Problems setting up Intel AMT

I am trying to configure Intel AMT for remote KVM access on a SuperMicro MBD-X9SCV-Q-O motherboard with an Intel Core i5-2520M processor, both of which claim to support Intel vPro.

The BIOS provides three settings that seem related to AMT/ME:

1. AMT: ENABLE/disable
2. Unconfigure AMT/ME: enable/DISABLE
3. Set ME to disable Mode: enable/DISABLE

(the capitalized option is the one I have chosen currently, but I've tried going through all combinations with no real difference in resultacu)

I've tried several approaches:

• Enter MEBx tool during POST using Ctrl-P:
  The tool does not prompt me for a (new) password, when it opens as I would expect and provides only the following menu structure:

• Intel(R) ME General Settings
  • FW Update Settings
    • Local FW Update: disabled/ENABLED/password protected
  • Set PRTC
  • Power Control
    • Intel(R) ME ON in Host Sleep States: mobile: on in s0/MOBILE: ON IN S0, ME WAKE IN S4, S4-5 (AC ONLY)
    • Idle Timeout: 65535
• Exit

No mention of AMT anywhere or a Supported Features setting.

The version of the tool is "Intel(R) Management Engine BIOS Extension v7.0.0053/Intel(R) ME v7.1.40.1161

• Use the Intel ACU Wizard:
  The tool loads correctly and shows the following system information:

Intel(R) AMT State

Intel AMT on this system:       Supported

System configuration state:     Not configured

Intel(R) AMT Information:

Release:                                7.1.40

UUID:                                    000000000-0000-0000-0000-0025907CEF18

Client Control Mode:               Supported

The tool allows me to enter all configuration settings, but when I click "Configure", it fails with this error message:

Failed to complete the Setup operation on this Intel(R) AMT device. Unknown error 1Intel(R) AMT configuration failed. The caller is unauthorized. Valid password for the default admin user not found. Verify the password. AMT Status code - Invalid AMT mode. The SKU version is not supported.

• Attempt to provision the server form a USB drive:
  If I boot with the USB stick inserted, the MEBx tool prompts me with "Found USB Key for provisioning. Continue with Auto Provisioning (Y/N)?"
  If I answer "Y", it displays the following error message:

Intel(R) AMT is disabled and USB data missing Manageability Feature Selection

Network and provisioning settings will not be applied.

Configuration Settings from the USB file were successfully applied

Press any key to continue with system boot...

Any ideas what I might be missing?